micro-fix: add module entrypoint for python -m core

[Jerichho]

Description

This PR fixes an issue where running Hive as a module via python -m core fails because the package does not define a core.__main__ entrypoint.

It adds a core/__main__.py file that forwards execution to the existing Hive CLI while ensuring the internal framework package can be resolved at runtime.

This enables the standard Python module execution pattern and improves developer experience and CLI consistency.

Type of Change

• [X ] Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Refactoring (no functional changes)

Related Issues

Fixes #4325

Changes Made

• Added core/__main__.py to enable execution via python -m core
• Inserted core/ into sys.path so the framework package resolves correctly
• Forwarded execution to the existing Hive CLI entrypoint

Testing

Describe the tests you ran to verify your changes:

Manual testing performed:

• Verified uv run python -m core --help now displays CLI help output

• Confirmed previous error (No module named core.__main__) is resolved

• Unit tests pass (cd core && pytest tests/)

• Lint passes (cd core && ruff check .)

• [X ] Manual testing performed

Checklist

• [X ] My code follows the project's style guidelines
• [ X] I have performed a self-review of my code
• [X ] I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• [X ] My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

Screenshots (if applicable)

Add screenshots to demonstrate UI changes.